.mainbox{
    position: relative;
    width: 95%;
    height: 80vh;
    margin: 20px auto;
    border: 1px solid rgb(204, 204, 204);
    border-radius: 5px;
}
.modifyheader{
    box-sizing:border-box;
    position: absolute;
    font-size: 20px;
    font-weight: bold;
    top: 20px;
    left: 20px;
    width: 95%;
   padding-bottom: 10px;
  border-bottom: 1px solid rgb(204, 204, 204);  
}
.modifybody{
    position: absolute;
    top: 70px;
    left: 20px;
    font-size: 20px;
    font-weight: bold;
}